CN103792808A - Image forming apparatus - Google Patents

Abstract

The invention provides an image forming apparatus. The image forming apparatus comprises a first image carrier, second image carriers, a transfer belt, a drive roller, a driven roller, a roller position adjustment mechanism, a position information acquiring portion for acquiring position information of the transfer belt, a first opposing portion causing the transfer belt to contact the first image carrier, second opposing portions causing the transfer belt to be disposed at either contact positions that cause the transfer belt to contact the plurality of second image carriers or separation positions that cause the transfer belt to be separated from the plurality of second image carriers, a movement mechanism portion moving the second opposing portions to the contact positions or the separation positions, a first control portion controlling the roller position adjustment mechanism according to position information acquired by the position information acquiring portion, so as to return the transfer belt to a target position, and a second control portion controlling the movement mechanism portion to change the positions of the primary transfer rollers, when the transfer belt does not return into a correction range centered on the target position within a predetermined time and is out of the correction range.

Description

Image processing system

Technical field

The present invention relates to a kind of image processing system, the coloured image that this image processing system can form monochromatic black white image and be made up of multiple color.

Background technology

The image processing systems such as color printer comprise: multiple photosensitive drums, for example, form the versicolor toner image of black, yellow, magenta and cyan; And intermediate transfer belt, transfer printing is formed on the toner image in above-mentioned multiple photosensitive drums.Be formed on versicolor toner image in each photosensitive drums by after primary transfer is on intermediate transfer belt, be together transferred secondarily to paper from intermediate transfer belt.Thus, on paper, form coloured image.

Above-mentioned intermediate transfer belt is erected between the driven roller and multiple driven voller being connected with drive sources such as motor.Intermediate transfer belt is followed the rotation of driven roller and is rotated (annular movement), thereby toner image is transferred on the position relative with each photosensitive drums successively.

Intermediate transfer belt is the Width swing along roller sometimes in rotation process.If intermediate transfer belt swings in rotation process, by toner image from each photosensitive drums primary transfer to intermediate transfer belt time, the position of toner image is mutually offset and causes chromatography inaccurate.

In the past, known a kind of image processing system, this image processing system comprises: swing off mode, so that the intermediate transfer belt swinging returns to the mode of target location (becoming position or this scope of benchmark), make the posture of driven voller remove position in swinging; And balance Holdover mode, make the posture of driven voller in equilibrium position, so that intermediate transfer belt is remained on target location.In above-mentioned image processing system, can, by carrying out described swing off mode, make the intermediate transfer belt swinging return to target location.

Intermediate transfer belt is sometimes for example because of the assembly failure anomalous swing of the driving mechanisms such as driven roller.When intermediate transfer belt anomalous swing, even if sometimes make image processing system turn round with above-mentioned swing off mode, can not make intermediate transfer belt return to target location.In this case, the printing of being undertaken by image processing system stops automatically.And, until during completing described bad phenomenon and repairing, the state that image processing system becomes can not carry out colored printing, can not carry out black and white printing.

Summary of the invention

The object of the invention is to avoid as far as possible become the state that can not form coloured image, can not form black white image in the time of intermediate transfer belt generation anomalous swing.

The invention provides a kind of image processing system, this image processing system comprises: the first image carrier, forms toner image; Multiple the second image carriers, form toner image; The transfer belt of annular, transfer printing is formed on the described toner image on described the first image carrier and/or described the second image carrier; Driven roller, rotates and supports freely described transfer belt, and described transfer belt is rotated; Driven voller, rotates and supports freely described transfer belt; The first opposed portion, across described transfer belt and relative configuration of described the first image carrier, makes described transfer belt and described the first image carrier butt; Multiple the second opposed portions, across described transfer belt and relative configuration of described multiple the second image carriers, can be arranged in and make the butt position of described transfer belt and described multiple the second image carrier butts and make described transfer belt leave a position leaving position of described multiple the second image carriers; Portion of travel mechanism, the position that makes described multiple the second opposed portions to described butt position or described in leave position and move; Positional information obtaining section, obtains the positional information on the Width of described transfer belt; Roller position adjusting mechanism, adjusts the posture of the rotation axis of described driven voller; The first control part, according to the positional information of the described transfer belt being obtained by described positional information obtaining section, is identified for making described transfer belt to return to the update information of predefined target location, and controls described roller position adjusting mechanism according to described update information; And second control part, at described the first control part according in roller position adjusting mechanism process described in described update information control, in the time that described transfer belt is not returned in the extent of amendment centered by described target location and outside extent of amendment at the appointed time, portion of travel mechanism described in described the second control part control, changes the position of described multiple the second opposed portions.

According to the present invention, a kind of image processing system can be provided, can avoid as much as possible becoming the state that can not carry out image formation in the time of intermediate transfer belt generation anomalous swing.

Content of the present invention is suitably with reference to accompanying drawing, and the form after the content of summarizing by the concept making recording in following detailed description simplifies is introduced.The intention of content of the present invention is not key character and the essential characteristic that limits the theme of recording in claim, and in addition, intention neither limit the subject area of recording in claim.In addition, the object of recording in the claims, is not limited to solve the embodiment of part or all shortcoming of recording in arbitrary portion in the present invention.

Accompanying drawing explanation

Fig. 1 is the figure of the configuration of each textural element of the printer for embodiment is described.

Fig. 2 is the block diagram that represents the function composing of printer.

Fig. 3 is the stereographic map that represents printer outward appearance.

Fig. 4 represents the belt sensor of belting and the stereographic map of driven voller.

Fig. 5 is the stereographic map that represents the belt sensor structure of belting.

Fig. 6 is the schematic diagram that is subject to optical range that represents light accepting part.

Fig. 7 represents the driven voller of belting and the stereographic map of peripheral part thereof.

Fig. 8 A is the schematic diagram that represents portion of travel mechanism structure.

Fig. 8 B is the schematic diagram that represents portion of travel mechanism structure.

Fig. 9 represents that the middle execution of control part (the first control part, the second control part) intermediate transfer belt swings the process flow diagram for the treatment of step while correction.

Figure 10 represents that the middle execution of control part (the first control part, the second control part) intermediate transfer belt swings the process flow diagram for the treatment of step while correction.

Figure 11 represents that the middle execution of control part (the first control part, the second control part) intermediate transfer belt swings the process flow diagram for the treatment of step while correction.

Figure 12 is the curve map that represents to carry out the displacement with end face while making the fixing swing correction in the past of Tape movement speed.

Figure 13 is the curve map of the displacement with end face while representing to carry out the swing correction of embodiment.

Figure 14 is the curve map that represents to carry out in four look colored printings the displacement with end face while swinging correction.

Figure 15 is the curve map that represents to carry out in black and white printing the displacement with end face while swinging correction.

Embodiment

With reference to the accompanying drawings, embodiment when image processing system of the present invention is applied to the printer that can carry out four look colored printings and black and white printing is described.

Utilize Fig. 1 and Fig. 2, the one-piece construction of the printer 1 to present embodiment describes.Fig. 1 is the figure of the configuration of each textural element of the printer 1 for present embodiment is described.Fig. 2 is the block diagram that represents the function composing of printer 1.Fig. 3 is the stereographic map that represents printer 1 outward appearance.

As shown in Figure 1, the printer 1 of present embodiment comprises: apparatus main body M, belting 20, image forming part 30 and confession ADF portion 40.In addition, as shown in Figure 2, printer 1, except comprising said structure key element, also comprises operating portion 70, storage part 75, portion of travel mechanism 90 and control part 100.

As shown in Figure 1, the profile of the apparatus main body M of printer 1 is made up of the housing BD as casing.

As shown in Figure 1, the image information of image forming part 30 based on regulation, is formed on toner image on the laminar paper T that is transferred material.Image forming part 30 comprises: photosensitive drums 2a, 2b, 2c, 2d, electro- mechanical part 10a, 10b, 10c, 10d, laser scan unit 4a, 4b, 4c, 4d, developer 16a, 16b, 16c, 16d, toner Cartridge 5a, 5b, 5c, 5d, toner supply unit 6a, 6b, 6c, 6d, drum cleaning section 11a, 11b, 11c, 11d, except electrical equipment 12a, 12b, 12c, 12d, primary transfer roller 13a, 13b, 13c, 13d, transfer section 50 and photographic fixing portion 60.In addition, image forming part 30 comprises as the driven voller 16 of mechanism and driven roller 17, in belting 20(aftermentioned) in said apparatus is described.

In addition, as shown in Figure 1, provide paper T for ADF portion 40 to image forming part 30, and the paper T that is formed with toner image is discharged.Comprise for ADF portion 40: paper feeding cassette 52, manually the transfer passage L, alignment roller of sheet feed section 64, paper T to 80, multiple roller or roller be to (omission Reference numeral) and paper delivery portion 61.In addition, as described later, transfer passage L is the aggregate of the first transfer passage L1, the second transfer passage L2, the 3rd transfer passage L3, manual feed passage La and loopback channel Lb.

Then, with the order of image forming part 30, confession ADF portion 40, belting 20, each structure is described.

First, image forming part 30 is described.In image forming part 30, respectively along photosensitive drums 2a, 2b, 2c, move successively as follows from upstream one side direction downstream one side (from the left side of Fig. 1 to the right) on the surface of 2d: by electro- mechanical part 10a, 10b, 10c, it is charged that 10d carries out, by laser scan unit 4a, 4b, 4c, the exposure that 4d carries out, by developer 16a, 16b, 16c, the development that 16d carries out, be designated hereinafter simply as " band " by intermediate transfer belt 7() and primary transfer roller 13a, 13b, 13c, the primary transfer that 13d carries out, by removing electrical equipment 12a, 12b, 12c, what 12d carried out removes electricity, and by drum cleaning section 11a, 11b, 11c, it is clean that 11d carries out.

In addition,, in image forming part 30, carry out secondary transfer printing by intermediate transfer belt 7, secondary transfer roller 8 and driven roller 17, and carry out photographic fixing by photographic fixing portion 60.

Each photosensitive drums 2a, 2b, 2c, 2d are the image carriers being made up of drum member.In the present embodiment, photosensitive drums 2a is the second image carrier that forms yellow (Y) toner image.Photosensitive drums 2b is the second image carrier that forms cyan (C) toner image.Photosensitive drums 2c is the second image carrier that forms magenta (M) toner image.In addition, photosensitive drums 2d is the first image carrier that forms black (B) toner image.

While forming coloured image, on photosensitive drums 2a, 2b, 2c, 2d, form versicolor toner image.In addition,, while forming black white image, on photosensitive drums 2d, form the toner image of black, and do not form toner image on other photosensitive drums 2a, 2b, 2c.

Photosensitive drums 2a, 2b, 2c, 2d are configured to respectively centered by arbor, to rotate along the direction of arrow, and this arbor extends along the direction vertical with the moving direction of intermediate transfer belt 7.On the surface of each photosensitive drums 2a, 2b, 2c, 2d, form electrostatic latent image.

The relative configuration in surface of each electro- mechanical part 10a, 10b, 10c, 10d and each photosensitive drums 2a, 2b, 2c, 2d.Each electro- mechanical part 10a, 10b, 10c, 10d make the surface of each photosensitive drums 2a, 2b, 2c, 2d with identical negative electricity (negative polarity) or positive electricity (positive polarity).

Laser scan unit 4a, 4b, 4c, 4d bring into play function as exposing unit.Laser scan unit 4a, 4b, 4c, 4d are respectively away from the surface configuration of photosensitive drums 2a, 2b, 2c, 2d.Laser scan unit 4a, 4b, 4c, 4d are made up of (omission Reference numerals) such as not shown LASER Light Source, polygonal-mirror and polygonal-mirror drive motors respectively.

Laser scan unit 4a, 4b, 4c, 4d are respectively based on from PC(personal computer) etc. the image information of external unit input, respectively scan exposure is carried out in the surface of photosensitive drums 2a, 2b, 2c, 2d.On the surface of photosensitive drums 2a, 2b, 2c, 2d, remove respectively the electric charge of the part that is scanned exposure.Thus, on the surface of photosensitive drums 2a, 2b, 2c, 2d, form electrostatic latent image respectively.

Each developer 16a, 16b, 16c, 16d and each photosensitive drums 2a, 2b, 2c, 2d be corresponding arrange and with relative configuration the in surface of photosensitive drums 2a, 2b, 2c, 2d.Developer 16a, 16b, 16c, 16d make respectively versicolor toner be attached on electrostatic latent image, this electrostatic latent image is respectively formed on the surface of photosensitive drums 2a, 2b, 2c, 2d, thereby colored toner image is respectively formed on the surface of photosensitive drums 2a, 2b, 2c, 2d.Developer 16a, 16b, 16c, 16d are corresponding with yellow, cyan, magenta, four kinds of colors of black respectively. Developer 16a, 16b, 16c, 16d are made up of (omission Reference numerals) such as agitating rollers for stirring with developer roll, the toner of the relative configuration in surface of photosensitive drums 2a, 2b, 2c, 2d respectively.

Each toner Cartridge 5a, 5b, 5c, 5d and each developer 16a, 16b, 16c, the corresponding setting of 16d, and the versicolor toner providing to developer 16a, 16b, 16c, 16d is provided respectively.Toner Cartridge 5a, 5b, 5c, 5d accommodate respectively the toner of yellow toner, cyan, the toner of magenta, the toner of black.

Each toner supply unit 6a, 6b, 6c, 6d and each toner Cartridge 5a, 5b, 5c, 5d and each developer 16a, 16b, 16c, the corresponding setting of 16d.Each toner supply unit 6a, 6b, 6c, 6d offer developer 16a, 16b, 16c, 16d by the versicolor toner being housed in each toner Cartridge 5a, 5b, 5c, 5d respectively.Each toner supply unit 6a, 6b, 6c, 6d and each developer 16a, 16b, 16c, 16d are connected by not shown toner feed path.

On the other hand, across intermediate transfer belt 7 and photosensitive drums 2a, 2b, the contrary side of 2c, 2d relative primary transfer roller 13a, 13b, 13c, the 13d of disposing respectively.The established part of intermediate transfer belt 7 is clamped by each primary transfer roller 13a, 13b, 13c, 13d and each photosensitive drums 2a, 2b, 2c, 2d.The above-mentioned established part being held respectively with the surperficial crimping of photosensitive drums 2a, 2b, 2c, 2d.

Between each photosensitive drums 2a, 2b, 2c, 2d and each primary transfer roller 13a, 13b, 13c, 13d, form respectively primary transfer crack N1a, N1b, N1c, N1d.In each primary transfer crack N1a, N1b, N1c, N1d, be developed in respectively versicolor toner image on photosensitive drums 2a, 2b, 2c, 2d by primary transfer successively to intermediate transfer belt 7.Thus, on intermediate transfer belt 7, form four color colour toners images.

In addition, as described later, primary transfer roller 13a, 13b, 13c, driven voller 16 and jockey pulley 19 utilize the 90(of portion of travel mechanism not shown in Fig. 1 with reference to Fig. 8), configure in the mode that can move along above-below direction in figure.

In printer 1, in the time forming four color colour toners images, utilize portion of travel mechanism 90 that primary transfer roller 13a, 13b, 13c, driven voller 16 and jockey pulley 19 are moved to the lower direction in figure.Thus, as mentioned above, between each photosensitive drums 2a, 2b, 2c, 2d and each primary transfer roller 13a, 13b, 13c, 13d, form respectively primary transfer crack N1a, N1b, N1c, N1d.

In addition,, in printer 1, in the time forming the toner image of black and white, utilize portion of travel mechanism 90 that primary transfer roller 13a, 13b, 13c, driven voller 16 and jockey pulley 19 are moved to the upper direction in figure.Thus, only between photosensitive drums 2d and primary transfer roller 13d, form primary transfer crack N1d.

In Fig. 1, primary transfer roller 13a, 13b, 13c across intermediate transfer belt (band) 7 with multiple photosensitive drums (the second image carrier) 2a, 2b, 2c is relative configures, form respectively multiple the second opposed portions, above-mentioned multiple the second opposed portions can be to intermediate transfer belt 7 and multiple photosensitive drums 2a, 2b, the butt position (aftermentioned) of 2c butt and any one position left in position (aftermentioned) that makes intermediate transfer belt 7 leave multiple photosensitive drums 2a, 2b, 2c are moved.

In addition, in Fig. 1,2d is relative configures across intermediate transfer belt 7 and photosensitive drums (the first image carrier) for primary transfer roller 13d, forms the first opposed portion that makes intermediate transfer belt 7 and photosensitive drums 2d butt.In addition, the structure of portion of travel mechanism 90 will be described hereinafter.

Apply primary transfer bias voltage to primary transfer roller 13a, 13b, 13c, 13d respectively by not shown primary transfer bias voltage applying unit, above-mentioned primary transfer bias voltage is for being transferred to intermediate transfer belt 7 by the versicolor toner image being respectively formed on photosensitive drums 2a, 2b, 2c, 2d.

Respectively except electrical equipment 12a, 12b, 12c, 12d and relative configuration the in surface of each photosensitive drums 2a, 2b, 2c, 2d.Respectively except electrical equipment 12a, 12b, 12c, 12d are by the surface irradiation light to each photosensitive drums 2a, 2b, 2c, 2d, respectively to having carried out the photosensitive drums 2a after primary transfer, 2b, 2c, electric (removing electric charge) remove on 2d surface.

The relative configuration in surface of each bulging cleaning section 11a, 11b, 11c, 11d and each photosensitive drums 2a, 2b, 2c, 2d.Each bulging cleaning section 11a, 11b, 11c, 11d remove and remain in each photosensitive drums 2a, 2b, the lip-deep toner of 2c, 2d and attachment, and by conveyings such as the toners of removing and be recovered to the recovering mechanism of regulation.

Transfer section 50 will be transferred in the lip-deep toner image of intermediate transfer belt 7 and be transferred on paper T.Transfer section 50 comprises secondary transfer roller 8 and driven roller 17.

Secondary transfer roller 8 for by primary transfer four color colour toners image secondary transfer printings on intermediate transfer belt 7 to paper T.Utilize not shown secondary transfer printing bias voltage applying unit to apply secondary transfer printing bias voltage to secondary transfer roller 8, this secondary transfer printing bias voltage is for being transferred to paper T by the four color colour toners images that are formed on intermediate transfer belt 7.

Secondary transfer roller 8 is with intermediate transfer belt 7 butts or leave intermediate transfer belt 7.Specifically, secondary transfer roller 8 be configured to can and the butt position of intermediate transfer belt 7 butts and leave leaving between position of intermediate transfer belt 7 and move.Specifically, secondary transfer roller 8 is being configured in primary transfer on butt position to time on paper T at the lip-deep four color looks of intermediate transfer belt 7 or black and white toner image secondary transfer printing, and is configured in and leaves on position in other cases.

Disposing driven roller 17 across intermediate transfer belt 7 side contrary to secondary transfer roller 8.

The established part of intermediate transfer belt 7 is clamped by secondary transfer roller 8 and driven roller 17.Between intermediate transfer belt 7 and secondary transfer roller 8, form secondary transfer printing crack N2.In secondary transfer printing crack N2, the outside surface of paper T and intermediate transfer belt 7 (toner image is by the face of primary transfer) crimping.The four color colour toners images of primary transfer on intermediate transfer belt 7 are transferred secondarily on paper T in secondary transfer printing crack N2.

Photographic fixing portion 60 makes the versicolor toner fusing of the formation toner image of secondary transfer printing on paper T and it is pressurizeed and it is fixed on paper T.Photographic fixing portion 60 comprises: the heating tumbler 60a that utilizes well heater (not shown) to heat; And with the pressurization tumbler 60b of heating tumbler 60a crimping.Heating tumbler 60a and pressurization tumbler 60b have the paper T of toner image to clamp pressurization to secondary transfer printing, and by a paper T side conveying downstream.When paper T carries under the state being clamped between heating tumbler 60a and pressurization tumbler 60b, the toner fusing of transfer printing is also pressurized.Thus, the toner being transferred on paper T is fixed on the surface of paper T.

Then, to describing for ADF portion 40.As shown in Figure 1, dispose the paper feeding cassette 52 of accommodating paper T in the bottom of apparatus main body M.Paper feeding cassette 52 can be extracted out by along continuous straight runs from the casing of apparatus main body M.In paper feeding cassette 52, dispose the loading plate 54 of carrying paper T.Paper T is housed in paper feeding cassette 52 with the state being layered on loading plate 54.Utilize the box sheet feed section 51 that is configured in paper feeding side end (end on right side in Fig. 1) in paper feeding cassette 52, the paper T being carried on loading plate 54 is sent to the first transfer passage L1.Box sheet feed section 51 comprises that this is fed forward roller 55 for taking out the paper T on loading plate 54 by being fed forward roller 55 and paper feed roller to the 81 anti-locking mechanisms of overlapping conveying that form, this paper feed roller to 81 for sending to transfer passage L a sheet by a sheet paper T.

Left surface (left side in Fig. 1) at apparatus main body M is provided with the manual sheet feed section 64 of accommodating paper T.Manually the fundamental purpose of sheet feed section 64 is: by be placed on paper T different size in paper feeding cassette 52 or the paper T of kind and offer apparatus main body M.Manually sheet feed section 64 comprises manual feed tray 65 and supplies paper roller 66, and this manual feed tray 65 is descended a part for the left surface of constituent apparatus main body M in off position.The lower end of manual feed tray 65 is mounted to rotation (switch freely) freely near for paper roller 66.Paper T is placed in the manual feed tray 65 of open mode.For paper roller 66, the paper T being placed in the manual feed tray 65 of open mode is provided to manual feed passage La.

Carry the transfer passage L of paper T to comprise: the first transfer passage L1 from box sheet feed section 51 to secondary transfer printing crack N2; The second transfer passage L2 from secondary transfer printing crack N2 to photographic fixing portion 60; The 3rd transfer passage L3 from photographic fixing portion 60 to paper delivery portion 61; Manual feed passage La, making provides the paper coming to collaborate the first transfer passage L1 from manual sheet feed section 64; Loopback channel Lb, makes the paper pros and cons of carrying from downstream one side direction upstream one side in the 3rd transfer passage L3 overturn and return to the first transfer passage L1.

The first transfer passage L1 carries the paper T being housed in paper feeding cassette 52 to image forming part 30.Manual feed passage La by be housed in paper T in manual sheet feed section 64 to alignment roller described later to 80 conveyings.

In addition, be provided with the first P1 of interflow portion and the second P2 of interflow portion midway at the first transfer passage L1.Be provided with the first Q1 of shunt portion midway at the 3rd transfer passage L3.

The first P1 of interflow portion is the interflow portion at manual feed passage La and the first transfer passage L1 interflow.The second P2 of interflow portion is the interflow portion at loopback channel Lb and the first transfer passage L1 interflow.The first Q1 of shunt portion is that loopback channel Lb is from the 3rd transfer passage L3 shunt portion along separate routes.

In the first transfer passage L1 midway, (specifically, between the second P2 of interflow portion and secondary transfer roller 8) disposes: for detection of the paper detection sensor (not shown) of paper T; And alignment roller is to 80, revises and matched opportunity with the formation of image forming part 30 toner images for paper T depart from (inclination paper supply).The alignment roller that described paper detection sensor is configured in paper T throughput direction is to 80 front (upstream one side of throughput direction).Alignment roller carries out above-mentioned correction or adjusts and carry paper T opportunity based on the detected signal information from described paper detection sensor 80.

Between the first P1 of interflow portion in the first transfer passage L1 and the second P2 of interflow portion, dispose the first conveying roller to 82.The first conveying roller is configured in paper feed roller to 81 downstream one side to 82, clamping by paper feed roller to the 81 paper T that transport and to alignment roller to 80 conveyings.

Carry out printed on both sides on paper T time, loopback channel Lb is relative with intermediate transfer belt 7 with the contrary one side of face (not printing surface) of having carried out printing for making.In loopback channel Lb, there are multiple the second conveying rollers that paper T is carried to the second P2 of interflow portion to 83 every the arranged spaced of regulation.Can make the paper T pros and cons of carrying to paper delivery portion 61 1 sides from the first Q1 of shunt portion overturn and return to the first transfer passage L1 by loopback channel Lb, and above-mentioned paper T is transported to the alignment roller that is configured in secondary transfer roller 8 upstream one sides to 80 upstream one side.In secondary transfer printing crack N2, the toner image of regulation is transferred on the not printing surface that utilizes the paper T after the upset of loopback channel Lb pros and cons.

In the first Q1 of shunt portion, be provided with rectification element 58.Rectification element 58 carries out rectification by the throughput direction of the paper T sending from photographic fixing portion 60 and carry from upstream one side direction downstream one side in the 3rd transfer passage L3 to the direction of paper delivery portion 61, and the throughput direction of the paper T carrying from downstream one side direction upstream one side in the 3rd transfer passage L3 from paper delivery portion 61 is carried out to rectification to the direction of loopback channel Lb.

Be formed with paper delivery portion 61 in the end of the 3rd transfer passage L3.Paper delivery portion 61 is configured in the upper side of apparatus main body M.Paper delivery portion 61 is to left surface (left side in Fig. 1) opening of apparatus main body M.Paper delivery portion 61 is discharged to paper T the outside of apparatus main body M.Paper delivery portion 61 has distributing roller to 53.Can utilize distributing roller to 53, the paper T carrying from upstream one side direction downstream one side in the 3rd transfer passage L3 is discharged to the outside of apparatus main body M, and in paper delivery portion 61, makes the throughput direction of paper T overturn and paper T is carried to upstream one side of the 3rd transfer passage L3.

Be formed with the paper delivery stacking M1 of portion in the open side of paper delivery portion 61.The paper delivery stacking M1 of portion is formed on the upper surface (outside surface) of apparatus main body M.The paper delivery stacking M1 of portion is that the upper surface of apparatus main body M is recessed to form downwards.The bottom surface of the paper delivery stacking M1 of portion is formed by top component M2, a part for this top component M2 constituent apparatus main body M upper surface.Stacked and stack paper T on the upper surface of top component M2 that forms pile and put the M1 of portion, on this paper T, be formed with the toner image of regulation and be discharged from from paper delivery portion 61.In addition, on the assigned position of each transfer passage, dispose the sensor (not shown) of paper detection use.

Then, belting 20 is described.Belting 20 makes intermediate transfer belt 7 rotate the also swing of correction tape.Belting 20 comprises: intermediate transfer belt 7, driven voller 16, driven roller 17, the first driving motor 18, jockey pulley 19, belt sensor 21, roller position adjusting mechanism 22 and backing roll 23(as positional information obtaining section are with reference to Fig. 8).

Intermediate transfer belt 7 is endless belts, is erected on multiple rollers such as driven voller 16, driven roller 17, jockey pulley 19.Versicolor toner image respectively from primary transfer roller 13a, 13b, 13c, 13d by primary transfer to intermediate transfer belt 7.In addition, the versicolor toner image of primary transfer on intermediate transfer belt 7 is transferred secondarily on paper T on the position of secondary transfer roller 8.

Driven voller 16 rotates and supports freely intermediate transfer belt 7.Driven voller 16 is bearing in roller position adjusting mechanism 22(aftermentioned) on.

Driven roller 17 rotates and supports freely intermediate transfer belt 7 and intermediate transfer belt 7 is rotated.Driven roller 17 utilizes the rotating force applying from the first driving motor 18 to rotate to prescribed direction.

The first driving motor 18 provides rotating force to driven roller 17.The first driving motor 18 and control part 100(aftermentioned) be electrically connected.Utilize the driving signal of exporting from control part 100 to control the rotating speed of the first driving motor 18.

Jockey pulley 19 applies from inner side acting force laterally to intermediate transfer belt 7.The acting force that utilizes jockey pulley 19 to apply, provides the tension force of regulation to intermediate transfer belt 7.

Driven voller 16 and driven roller 17 are set each rotation axis (omission Reference numeral) for and are parallel to each other, and are configured in along on the relative position of the long side direction of intermediate transfer belt 7.Follow the rotation of driven roller 17, intermediate transfer belt 7 rotates between multiple rollers such as driven voller 16, driven roller 17, jockey pulley 19.

Then, the peripheral part that comprises belt sensor 21 and roller position adjusting mechanism 22 is described.Fig. 4 represents the belt sensor of belting 20 and the stereographic map of driven voller 16.Fig. 5 is the stereographic map of the belt sensor structure of belting 20.Fig. 6 is the schematic diagram that is subject to optical range that represents light accepting part 25.Fig. 7 represents the driven voller 16 of belting 20 and the stereographic map of peripheral part thereof.

As shown in Fig. 4 (or Fig. 1), belt sensor 21 is configured in the circumferential track of intermediate transfer belt 7 and near of driven voller 16.As shown in Figure 5, belt sensor 21 comprises: illuminating part 24, light accepting part 25 and shadow shield 26.Illuminating part 24 is to direction (below in Fig. 4 and Fig. 5) light irradiation of regulation.If the photo detector of light accepting part 25 r1～r20(aftermentioned) receive the light irradiating from illuminating part 24, using the magnitude of voltage corresponding with its light income as light quantity detection signal, (positional information) outputs to control part 100 respectively.Light accepting part 25 is configured on the position relative with illuminating part 24.Shadow shield 26 moves and is configured in freely between illuminating part 24 and light accepting part 25.

In addition, as shown in Figure 4 and Figure 5, belt sensor 21 comprises butt plate 27 and pitman 28.As shown in Figure 4, the band end face 7a butt of butt plate 27 and intermediate transfer belt 7.Pitman 28 connects butt plate 27 and shadow shield 26.Pitman 28 is supported to rotate freely with respect to illuminating part 24 and light accepting part 25.Butt plate 27 is supported on an end of pitman 28 by torsion spring 29.In addition,, on the cardinal principle center section of pitman 28, shadow shield 26 is fixed between illuminating part 24 and light accepting part 25.

At this, the optical range that is subject to of light accepting part 25 is described.As shown in Figure 6, multiple photo detector r1～r20(that the light accepting part 25 of belt sensor 21 is arranged by the Width (left and right directions in figure) along band have omitted a part of diagram and Reference numeral) form.In photo detector r1～r20, the photo detector r1～r10 that is configured in center line a right side detects the swing with end face 7a rear side.In addition the photo detector r11～r20 that, is configured in center line a left side detects the swing with end face 7a front side.In addition, front side refers in Fig. 3 compared with the center line a of apparatus main body M and relies on the scope of a side at the moment.In addition, rear side refers in Fig. 3 compared with the center line a of apparatus main body M and relies on inboard scope.

Center line a shown in Fig. 6 is with corresponding with the target location of end face 7a.Refer to the position with end face 7a when the center of intermediate transfer belt 7 Widths and the center of driven voller 16 Widths are consistent with the target location of end face 7a.By making the position with end face 7a consistent with target location, make the center of intermediate transfer belt 7 Widths consistent with the center of driven voller 16 Widths.

In the rotation process of intermediate transfer belt 7, control part described later (the first control part) 100 can make the position with end face 7a consistent with target location by control roll position adjusting mechanism 22, revises the swing (below also referred to as " swing and revise ") of intermediate transfer belt 7.Owing to revising by above-mentioned swing, by multiple toner images from photosensitive drums 2a, 2b, 2c, 2d primary transfer to intermediate transfer belt 7 time, suppressed the position skew of toner image, so can obtain the four color color images that do not exist chromatography inaccurate.

If photo detector r1～r20 receives the light irradiating from illuminating part 24, output to respectively control part 100 using the magnitude of voltage corresponding with its light income as light quantity detection signal.If the light irradiating from illuminating part 24 is with end face 7a to block, corresponding with this shading amount (shading position), make from the also change of magnitude of voltage of photo detector r1～r20 output.The magnitude of voltage of the light quantity detection signal of control part 100 based on exporting from photo detector r1～r20 respectively, determines the position with end face 7a.

Specifically, in Fig. 6, the magnitude of voltage of the light quantity detection signal of for example exporting from photo detector r1～r18 is less than predefined threshold voltage, and the magnitude of voltage of the light quantity detection signal of exporting from photo detector r19 is more than threshold voltage.In this case, can determine that position with end face 7a is between photo detector r18 and r19.In addition, in Fig. 6, the magnitude of voltage of the light quantity detection signal of exporting from photo detector r1～r10 is less than predefined threshold voltage, and the magnitude of voltage of the light quantity detection signal of exporting from photo detector r11 is more than threshold voltage.In this case, can determine the position (being target location) between photo detector r10 and r11 with end face 7a.

As shown in Figure 6, be configured in the photo detector r3～r10 of rear side and be configured in the photo detector r11 of front side～r18 the scope that receives the sensing range A1(boundary line b1～b2 of light) be the scope (below also referred to as " extent of amendment " or " in extent of amendment ") that detects the common swing producing on intermediate transfer belt 7.In the time that band end face 7a is in sensing range A1, (conventionally time swing correction) carried out and described later first revised to control part 100.

In addition, as shown in Figure 6, the photo detector r19, the r20 that are configured in photo detector r1, the r2 of rear side and are configured in front side receive the sensing range A2(boundary line b1～c1 of light and the scope of boundary line b2～c2) be the scope (below also referred to as " permissible range " or " in permissible range ") that detects the anomalous swing producing on intermediate transfer belt 7.In addition, sensing range A2 is also the scope outside sensing range A1.In the time that band end face 7a is in sensing range A2, when abnormal (swing correction) carried out and described later second revised to control part 100.

In addition, as shown in Figure 6, rely on outside compared with being configured in the photo detector r1 of rear side and rely on the sensing range A3(boundary line c1 in outside and the scope in the outside of c2 compared with being configured in the photo detector r20 of front side) be the scope (below also referred to as " outside permissible range ") that detects the larger anomalous swing producing on intermediate transfer belt 7.In the time that band end face 7a is in sensing range A3, processing when control part 100 is carried out emergency condition.

In Fig. 4, if intermediate transfer belt 7 swings along the Width of band, move along the Width of band too with the butt plate 27 with end face 7a butt.Follow in this, the shadow shield 26 being connected with butt plate 27 moves (with reference to Fig. 5) between illuminating part 24 and light accepting part 25.The shading amount of the light irradiating from illuminating part 24 that the light income of the light that now, light accepting part 25 receives blocks according to shadow shield 26 changes.Light accepting part 25 is electrically connected with control part 100.Light accepting part 25 using with photo detector r1～r20(with reference to Fig. 6) magnitude of voltage corresponding to light income output to control part 100 as light quantity detection signal.The light quantity detection signal of control part 100 based on exporting from light accepting part 25, determines the position with end face 7a.

Belt sensor 21 detects the position with end face 7a with official hour interval.Control part 100 is based on from belt sensor 21(light accepting part 25) light quantity detection signal of output carrys out control roll position adjusting mechanism 22, makes to approach with the position of end face 7a the target location (with reference to Fig. 6) of bandwidth direction.Thus, the swing of intermediate transfer belt 7 is revised.At this, before the control of being undertaken by control part 100 in explanation, the structure of first pair roller position adjusting mechanism 22 describes.

As shown in Figure 7, driven voller 16 is take the end (not shown) of rotation axis 32 as basic point, and another end 32a of its rotation axis 32 is supported to tilt to the both forward and reverse directions of regulation.Tilt to the both forward and reverse directions of regulation by another end 32a that makes rotation axis 32, can make to be erected at the intermediate transfer belt 7(band end face 7a on driven voller 16) move along the Width of driven voller 16.

Therefore, can be by adjusting the vergence direction (top/below) of rotation axis 32 of driven voller 16, make with end face 7a along the Width of band towards front side or the rear side shifting of a side contrary to it.

In addition, can be by adjusting the angle of inclination of rotation axis 32 of driven voller 16, change with end face 7a along the Width of band to front side or the speed of the rear side shifting of a side contrary to it.

As shown in Figure 7, the major part of roller position adjusting mechanism 22 comprises: scaffold 33, swinging mounting axle 35, cam 36, gear 37 and the second driving motor 38.Scaffold 33 has bearing 34, and described bearing 34 supports the rotation axis 32 of driven voller 16, and it is rotated freely.Swinging mounting axle 35 supports scaffold 33, can swing.Cam 36 makes scaffold 33 swing take swinging mounting axle 35 as basic point.Gear 37 is coaxial and be integrally formed with cam 36.Gear 37 and cam 36 support shafts (omission Reference numeral) are supported to and can rotate.

The second driving motor 38 provides rotating force to gear 37.The second driving motor 38 is made up of pulse motor.The second driving motor 38 with control part 100(with reference to Fig. 1) be electrically connected.Control part 100, by export the driving pulse (driving signal) of stated number to the second driving motor 38, drives the second driving motor 38.The second driving motor 38 has the output shaft 39 engaging with gear 37.

Scaffold 33 is configured on the Width of driven voller 16 and stretches out along the long side direction of intermediate transfer belt 7.On an end 33a of scaffold 33, be provided with bearing 34.In addition, there is swinging mounting axle 35 at another end of scaffold 33 33b upper support.Cam 36 and abutting part (not shown) butt being arranged on an end 33a of scaffold 33.

In the roller position adjusting mechanism 22 forming in the above described manner, make as follows moving along the Width of band with end face 7a of intermediate transfer belt 7.First, the light quantity detection signal of control part 100 based on exporting from light accepting part 25, the driving pulse of output stated number.Thus, in the second driving motor 38, produce driving force.The driving force (rotating force) producing in the second driving motor 38 passes to gear 37 by output shaft 39, and thus, gear 37 rotates.Follow in this, the cam 36 being integrally formed with gear 37 makes an end 33a of scaffold 33 swing take swinging mounting axle 35 as basic point.Another end 32a of the rotation axis 32 of the driven voller 16 being supported by bearing 34 thus, take an end of rotation axis 32 as basic point upward or below tilt.

For example, if make driven voller 16 rotation axis 32 another end 32a forward side-lower tilt, driven voller 16 from rear side forward side direction have a down dip.Therefore, intermediate transfer belt 7 follows rotation gradually to downward-sloping front side shifting.On the other hand, if make the rotation axis 32 of driven voller 16 32aXiang front side, another end top tilt, driven voller 16 from rear side forward side direction tilt.Therefore, intermediate transfer belt 7 follows rotation gradually to downward-sloping rear side shifting.

The angle of inclination of the rotation axis 32 of driven voller 16 can be adjusted by the driving pulse quantity of exporting to the second driving motor 38 from control part 100.In addition, the rotation direction of the second driving motor 38 can be switched by the polarity (+/-) that changes driving pulse.By switching the rotation direction of the second driving motor 38, can change the vergence direction of the rotation axis 32 of driven voller 16.

The angle of inclination of the rotation axis 32 of driven voller 16 is larger, and the movement of intermediate transfer belt 7 broad ways is faster.In addition, in the time adjusting angle of inclination, the rotating speed of driven roller 17 is faster, and the movement of intermediate transfer belt 7 broad ways is faster.In addition, control when control part 100 is revised the swing of intermediate transfer belt 7 will be described hereinafter.

Then, to operating portion 70, storage part 75, portion of travel mechanism 90 and control part 100(all with reference to Fig. 2) each structure describe.

Operating portion 70 has multiple keys (not shown).Operate when above-mentioned multiple key for example changes the setting of printer 1 or when operation is resetted etc.In the time that any one key is operated, the signal corresponding with the key that has carried out operation sent to control part 100 by operating portion 70.In addition, operating portion 70 comprises (all not shown) such as action buttons such as the display panel of state or information etc. of Display and Print machine 1 and power key, reset keys.

In addition, in the time of demonstration information on display panel etc., control part 100(aftermentioned) control display panel drive division (not shown), provide from display panel drive division to display panel drive signal or opportunity signal etc.

Storage part 75 is made up of hard disk or semiconductor memory etc.Storage part 75 is stored from said external equipment the view data etc. of coming is provided.

Then, portion of travel mechanism 90 is described.Fig. 8 (A), (B) are the schematic diagram that represents the structure of portion of travel mechanism 90.In Fig. 8 (A), (B), only represent the structure of portion of travel mechanism 90 and periphery thereof and omitted other structures.In addition,, in Fig. 8 (A), (B), the textural element identical with Fig. 1 and Fig. 2 adopts identical Reference numeral.

Portion of travel mechanism 90 comprises framework 91, offset cam 92 and the 3rd driving motor 93.

Framework 91 is the frame member of コ shape substantially while being viewed in plan.Framework 91 is supported to rotation freely by primary transfer roller 13a, 13b, 13c, driven voller 16, driven roller 17 and jockey pulley 19 on the both ends of each roller Width.Framework 91 is supported to rotate freely centered by the rotation axis 23a of backing roll 23.

In addition, utilize as the spring 14 that applies acting force member, framework 91 is applied centered by the rotation axis 23a of backing roll 23 to clockwise acting force.Backing roll 23 has framework 91 is bearing in to function on rotation axis 23a and in the time forming the toner image of black and white, keeps the function of primary transfer crack N1d.

Offset cam 92 is for making framework 91 respectively to butt position or to leave position (aftermentioned) mobile, and framework 91 is fixed on to butt position or leaves position.As shown in Figure 8, offset cam 92 is configured to and upper end 95 butts of framework 91.Offset cam 92 is supported to such an extent that rotate freely by cam rotation axis 94.In addition, offset cam 92 utilizes from the 3rd driving motor 93 rotating force of coming is provided, and rotates along clockwise direction or counterclockwise.

The 3rd driving motor 93 provides rotating force to offset cam 92.The 3rd driving motor 93 and control part 100(aftermentioned) be electrically connected.Utilize the driving signal of exporting from control part 100 to control the rotation of the 3rd driving motor 93.

In printer 1, in the time carrying out four look colored printings, provide rotating force from the 3rd driving motor 93 to offset cam 92 and make major diameter direction that offset cam 92 turns to offset cam 92 and intermediate transfer belt 7 vertical primary importance substantially.If offset cam 92 turns to primary importance, the acting force that the framework 91 of being pressed by offset cam 92 overcomes spring 14 rotates in the counterclockwise direction centered by the rotation axis 23a of backing roll 23.

Thus, as shown in Fig. 8 (A), intermediate transfer belt 7 and photosensitive drums 2a, 2b, 2c butt.Below, will make the position of intermediate transfer belt 7 and photosensitive drums 2a, 2b, 2c butt also referred to as " butt position " by the position that changes primary transfer roller 13a, 13b, 13c.In addition, primary transfer roller 13d makes intermediate transfer belt 7 and photosensitive drums 2d butt all the time.Therefore, if make intermediate transfer belt 7 to moving with the butt position of photosensitive drums 2a, 2b, 2c butt, intermediate transfer belt 7 and whole photosensitive drums 2a, 2b, 2c, 2d butt.Therefore,, by intermediate transfer belt 7 is moved to butt position, can in printer 1, carry out four look colored printings.

On the other hand, in printer 1, when carrying out black and white when printing, provide rotating force from the 3rd driving motor 93 to offset cam 92 and make offset cam 92 turn to the minor axis direction second place vertical with intermediate transfer belt 7 cardinal principles of offset cam 92.If offset cam 92 turns to the second place, framework 91 utilizes the acting force of spring 14 to rotate to clockwise direction centered by the rotation axis 23a of backing roll 23.

Thus, as shown in Fig. 8 (B), intermediate transfer belt 7 leaves multiple photosensitive drums 2a, 2b, 2c.Below, by the position that makes intermediate transfer belt 7 leave photosensitive drums 2a, 2b, 2c by the position that changes primary transfer roller 13a, 13b, 13c also referred to as " leaving position ".In addition, the line A shown in Fig. 8 (B) represents the position of the intermediate transfer belt 7 of butt position.As mentioned above, primary transfer roller 13d makes intermediate transfer belt 7 and photosensitive drums 2d butt all the time.Therefore, if intermediate transfer belt 7 is moved to the position of leaving of leaving photosensitive drums 2a, 2b, 2c, intermediate transfer belt 7 only with photosensitive drums 2d butt.Therefore,, by intermediate transfer belt 7 is moved to leaving position, can in printer 1, carry out black and white printing.

Then, control part 100 is described.Control part 100 comprise CPU, RAM and ROM(not shown).RAM is memory storage, has the function of temporary transient store various kinds of data and becomes the function of the operating area while calculating.ROM is memory storage, has the function as the flash memories of the various programs of storage.CPU reads the also calculation element of executive routine from ROM.Between CPU, RAM and ROM, carry out the transmitting-receiving of data by data bus (not shown).CPU, by carry out the program reading from ROM, carries out the processing corresponding with this contents of program.In addition, control part 100 has the timer function (below also referred to as " timer ") of being carried out to timing the time.

Control part 100 is controlled belting 20, image forming part 30, is supplied ADF portion 40 and portion of travel mechanism 90.In addition, control part 100 has the function as the first control part described later and the second control part.Below, control part 100 is recited as to " control part (the first control part) 100 " as the situation of the first control part performance function, control part 100 is recited as to " control part (the second control part) 100 " as the situation of the second control part performance function.

Control part (the first control part) 100 (being obtained by positional information obtaining section) light quantity detection signal (positional information of transfer belt) based on exporting from belt sensor 21, determine vergence direction and the angle of inclination of the rotation axis of driven voller 16, and control roll position adjusting mechanism 22, makes the rotation axis of driven voller 16 become described vergence direction and described angle of inclination.

Specifically, when the position of the definite intermediate transfer belt 7 of the light quantity detection signal by exporting from belt sensor 21 is in extent of amendment when (sensing range A1: with reference to Fig. 6), control part (the first control part) 100 control roll position adjusting mechanisms 22, make intermediate transfer belt 7 return to predefined target location (a is corresponding with center line: with reference to Fig. 6).Below, by the position of intermediate transfer belt 7 in extent of amendment time the swing correction of (conventionally time) also referred to as " first revises ".

In addition, when the position of the definite intermediate transfer belt 7 of the light quantity detection signal by exporting from belt sensor 21 is extent of amendment and in permissible range when (sensing range A2: with reference to Fig. 6), control part (the first control part) 100 control roll position adjusting mechanisms 22, make intermediate transfer belt 7 return to predefined target location, and control part (the first control part) 100 is controlled the first driving motors 18, fast when the rotating ratio first of driven roller 17 is revised.Below, by the position of intermediate transfer belt 7 outside extent of amendment and in permissible range time the swing correction of when abnormal () also referred to as " second revises ".

In addition, control part (the first control part) 100 is determined vergence direction and the angle of inclination of the rotation axis of driven voller 16 by comparable data table (ROM), the light quantity detection signal of exporting from belt sensor 21 in this tables of data (magnitude of voltage) is with corresponding for making intermediate transfer belt 7 return to vergence direction and the angle of inclination of rotation axis of the needed driven voller 16 in predefined target location.

In addition, in the second makeover process, when control part (the first control part) 100 control roll position adjusting mechanisms 22, while making intermediate transfer belt 7 return to predefined target location, control part (the first control part) 100 control roll position adjusting mechanisms 22, large angle of inclination while making the angle of inclination of the rotation axis of driven voller 16 become than the first correction.

In addition, when the position of the definite intermediate transfer belt 7 of the light quantity detection signal by exporting from belt sensor 21 is permissible range when the emergency condition of (sensing range A3: with reference to Fig. 6), control part (the first control part) 100 is controlled the first driving motor 18, and the rotation of driven roller 17 is stopped.

In addition, even when the function control roll position adjusting mechanism 22 by the first control part, in the time t1(stipulated time) in intermediate transfer belt 7 can not return in the extent of amendment centered by target location and outside this extent of amendment time, control part (the second control part) 100 is controlled portions of travel mechanism 90, changes primary transfer roller 13a, many second opposed portions of 13b, 13c() position.

Specifically, at primary transfer roller 13a, 13b, many the second opposed portions of 13c() be positioned under the state of butt position, even when control part (the second control part) 100 is as the first control part performance function, vergence direction and angle of inclination (update information) of the rotation axis by driven voller 16 are carried out control roll position adjusting mechanism 22, in the time t1(stipulated time) in intermediate transfer belt 7 can not return in extent of amendment, and outside extent of amendment time, control part (the second control part) 100 is controlled portion of travel mechanism 90, make primary transfer roller 13a, 13b, 13c moves to leaving position.

In addition, at primary transfer roller 13a, 13b, many the second opposed portions of 13c() be positioned under the state that leaves position, even when control part (the second control part) 100 is as the first control part performance function, vergence direction and angle of inclination (update information) of the rotation axis by driven voller 16 are carried out control roll position adjusting mechanism 22, in the time t1(stipulated time) in intermediate transfer belt 7 can not return in extent of amendment, and outside extent of amendment time, control part (the second control part) 100 is controlled portion of travel mechanism 90, make primary transfer roller 13a, 13b, 13c moves to butt position.

In addition, change primary transfer roller 13a, many second opposed portions of 13b, 13c(when control portions of travel mechanism 90 by control part (the second control part) 100) position, when intermediate transfer belt 7 returns in extent of amendment, control part (the second control part) 100 is controlled portion of travel mechanism 90, keeps the position after changing of primary transfer roller 13a, 13b, 13c.

Conduct first control part of above-mentioned control part 100 and the function of the second control part will describe with reference to process flow diagram in the back.

Then, the action of the printer 1 forming is in the above described manner described.First,, with reference to Fig. 1, the elemental motion of printer 1 is described.

(action while being printed on one side on paper T)

The paper T being housed in paper feeding cassette 52 sends to the first transfer passage L1 81 by being fed forward roller 55 and paper feed roller, after this by the first P1 of interflow portion and the first transfer passage L1 by the first conveying roller to 82 to alignment roller to 80 conveyings.

Alignment roller to 80 in, carry out paper T depart from revise and with form at image forming part 30 toner image opportunity adjust.

From alignment roller, the paper T of 80 discharges is imported into (secondary transfer printing crack N2) between intermediate transfer belt 7 and secondary transfer roller 8 by the first transfer passage L1.And, between intermediate transfer belt 7 and secondary transfer roller 8, toner image is transferred on paper T.

After this, paper T is from discharging between intermediate transfer belt 7 and secondary transfer roller 8, and is imported into the photographic fixing crack between heating tumbler 60a and the pressurization tumbler 60b of photographic fixing portion 60 by the second transfer passage L2.And, toner fusing in photographic fixing crack, toner is fixed on paper T.

Then, paper T carries to paper delivery portion 61 by the 3rd transfer passage L3, and is discharged to the paper delivery stacking M1 of portion from paper delivery portion 61 53 by distributing roller.Thus, finish to be housed in being printed on one side of paper T in paper feeding cassette 52.

On the other hand, while being printed on one side on the paper T being positioned in manual feed tray 65, be placed on paper T in manual feed tray 65 by sending to manual feed passage La for paper roller 66, after this, by the first P1 of interflow portion and the first transfer passage L1 to alignment roller to 80 conveyings.After this action is identical with the action being printed on one side that is housed in the paper T in paper feeding cassette 52 as above, and therefore description thereof is omitted.

(action carry out printed on both sides on paper T time)

In the time being printed on one side, as mentioned above, the paper T having carried out after being printed on one side discharges from paper delivery portion 61 to the paper delivery stacking M1 of portion and finishes printing and move.

With respect to this, in the time carrying out printed on both sides, carried out paper T after being printed on one side by loopback channel Lb, carry out pros and cons upset when being printed on one side, and again to alignment roller to 80 conveyings, on paper T, implement printed on both sides thus.

Specifically, carry out the paper T after being printed on one side until be discharged from roller and discharge from paper delivery portion 61 53, identical with the described action being printed on one side.But, in the time carrying out printed on both sides, carried out paper T after being printed on one side be discharged from roller to the state of 53 maintenances under, distributing roller is stopped 53 rotation and rotates in the opposite direction.Thus, if distributing roller is rotated in the opposite direction to 53, be discharged from roller to the paper T of 53 maintenances (direction from paper delivery portion 61 towards the first Q1 of shunt portion) conveying in the opposite direction in the 3rd transfer passage L3.

As mentioned above, if paper T is carried in the opposite direction in the 3rd transfer passage L3, utilize rectification element 58 that paper T is carried out to rectification to loopback channel Lb, after this, collaborate the first transfer passage L1 by the second P2 of interflow portion.At this, paper T has carried out pros and cons upset when being printed on one side.

In addition, utilize alignment roller to carry out described correction or described adjustment to 80 couples of paper T, and by the first transfer passage L1, paper T is imported to secondary transfer printing crack N2.Due to by making paper T via loopback channel Lb, make that printing surface is not relative with intermediate transfer belt 7, so toner image is transferred in not on printing surface, its result, can implement printed on both sides.

Then the treatment step while, control part (the first control part, the second control part) 100 being carried out to the swing correction of intermediate transfer belts 7 describes.Fig. 9, Figure 10 and Figure 11 are the process flow diagrams of the treatment step while representing that control part (the first control part, the second control part) 100 is carried out the swing correction of intermediate transfer belts 7.The processing of the process flow diagram shown in Fig. 9～Figure 11 is repeatedly carried out with official hour interval in the operation process of printer 1.

In the step ST101 shown in Fig. 9, control part (the first control part) 100 is from light accepting part 25(belt sensor 21) obtain light quantity detection signal.

In step ST102, the light quantity detection signal of control part (the first control part) 100 based on obtaining, determines the position with end face 7a (below also referred to as " detect band position ") of intermediate transfer belt 7.

In step ST103, control part (the first control part) 100 judges and detects band position whether in extent of amendment (sensing range A1).In above-mentioned steps ST103, when judgement detects band position in extent of amendment when (YES), control part (the first control part) 100 makes to process and advances to step ST104.In addition,, in step ST103, when judgement detects band position extent of amendment outside when (NO), control part (the first control part) 100 makes processing advance to step ST105.

At step ST104(step ST103: be judged as YES) in, (conventionally time swing correction) carried out and first revised to control part (the first control part) 100.Thus, the processing of process ends figure.In the first makeover process, control part (the first control part) 100 determined driving direction and the drive volume of the second driving motor 38 with position according to detection, and the driving signal of the number of drive pulses corresponding with above-mentioned driving direction and drive volume is exported to the second driving motor 38.In addition, control part (the first control part) 100 is controlled the rotating speed of the first driving motors 18, the speed while making the rotating speed (Tape movement speed) of driven roller 17 become the first correction.Therefore translational speed when, intermediate transfer belt 7 is with the first correction is rotated.

On the other hand, at step ST105(step ST103: be judged as NO) in, control part (the first control part) 100 judges and detects band position whether outside extent of amendment (sensing range A1) and in permissible range (sensing range A2).In above-mentioned steps ST105, when judgement detects band position extent of amendment outside and in permissible range when (YES), control part (the first control part) 100 makes processing advance to step ST106.In addition,, in step ST105, when judgement detects band position not extent of amendment outside and not in permissible range when (NO), control part (the first control part) 100 makes processing advance to step ST108.

At step ST106(step ST105: be judged as YES) in, control part (the first control part) 100 is controlled beltings 20, stops to the first driving motor 18 output drive signals.Thus, printer 1 interrupts printing treatment.In addition, control part (the first control part) 100 is controlled display panel drive division (not shown) simultaneously, makes the upper demonstration information of display panel (not shown) of operating portion 70, and this information notice is interrupted printing treatment because being with in swinging correction.

In step ST107, when abnormal (swing correction) carried out and second revised to control part (the first control part) 100.Specifically, be with location-independent with detection, the drive volume of the second driving motor 38 is set as maximal value by control part (the first control part) 100, and the driving signal of the number of drive pulses corresponding with above-mentioned peaked drive volume is exported to the second driving motor 38.Thus, the angle of inclination of setting when the angle of inclination of the rotation axis 32 of driven voller 16 is greater than the first correction.

In addition, in step ST107, the rotating speed of the first driving motor 18 is controlled to maximal value by control part (the first control part) 100, so that the rotating speed of driven roller 17 (Tape movement speed) is fast during than the first correction.Thus, it is fast when the rotating ratio of the first driving motor 18 first is revised.Therefore, the fast speed (at a high speed) of the translational speed of intermediate transfer belt 7 when than the first correction is rotated.

On the other hand, at step ST108(step ST105: be judged as NO) in, processing when control part (the first control part) 100 is carried out emergency condition.Specifically, control part (the first control part) 100 is controlled belting 20, stops to the first driving motor 18 output drive signals.Thus, printer 1 interrupts printing treatment (emergent stopping).In addition, control part (the first control part) 100 is controlled display panel drive division (not shown) simultaneously, makes the upper demonstration information of display panel (not shown) of operating portion 70, and this information notice is because of the abnormal printing treatment of interrupting of swing of band.Thus, the processing of process ends figure.

In addition, in step ST108, control part (the first control part) 100 is controlled display panel drive divisions (not shown), makes display notification on the display panel of operating portion 70 interrupt the information of printing treatment, and the information that also can display notification need to be checked by maintenance personal.

In the step ST109 shown in Figure 10, control part (the second control part) 100 starts timer (not shown), starts time t1 to carry out timing.

In step ST110, control part (the second control part) 100 judges whether the timing of being undertaken by timer has arrived time t1.In the judgement of above-mentioned steps ST110, when judging that the timing of being undertaken by timer has arrived time t1(YES) time, control part (the second control part) 100 makes to process and advances to step ST111.In addition, at the time point of timing t1 time of arrival being undertaken by timer, the timing of being undertaken by timer is resetted.

In addition, in the judgement of step ST110, when judge the timing undertaken by timer not time of arrival t1(NO) time, control part (the second control part) 100 makes to process and returns to step ST110.

At step ST111(step ST110: be judged as YES) in, control part (the second control part) 100 is from light accepting part 25(belt sensor 21) obtain light quantity detection signal.

In step ST112, the light quantity detection signal of control part (the second control part) 100 based on obtaining, determines the detection band position of intermediate transfer belt 7.

In step ST113, control part (the second control part) 100 judges and detects band position whether in extent of amendment (sensing range A1).In above-mentioned steps ST113, when judgement detects band position in extent of amendment when (YES), control part (the second control part) 100 makes to process and advances to step ST104(with reference to Fig. 9).In addition,, in step ST113, when judgement detects band position extent of amendment outside when (NO), control part (the second control part) 100 makes processing advance to step ST114.

At step ST114(step ST113: be judged as NO) in, control part (the second control part) 100 judge intermediate transfer belt 7 whether with the butt position of photosensitive drums 2a, 2b, 2c butt on.In above-mentioned steps ST114, when judging that intermediate transfer belt 7 is on butt position when (YES), control part (the second control part) 100 makes to process and advances to step ST115.In addition, in step ST114, when judge intermediate transfer belt 7 not on butt position (NO), while leaving on position, control part (the second control part) 100 makes to process and advances to step ST116.

At step ST115(step ST114:YES) in, control part (the second control part) 100 is controlled portions of travel mechanism 90, the position of intermediate transfer belt 7 is changed to from butt position and leave position (primary transfer roller 13a～13c is moved to and leave position).

At step ST116(step ST114:NO) in, control part (the second control part) 100 is controlled portion of travel mechanism 90, makes the position of intermediate transfer belt 7 change to butt position (making primary transfer roller 13a～13c move to butt position) from leaving position.

In the step ST117 shown in Figure 11, control part (the second control part) 100 starts timer (not shown), starts time t2 to carry out timing.

In step ST118, control part (the second control part) 100 judges whether the timing of being undertaken by timer has arrived time t2.In the judgement of above-mentioned steps ST118, when judging that the timing of being undertaken by timer has arrived time t2(YES) time, control part (the second control part) 100 makes to process and advances to step ST119.In addition, at the time point of timing t2 time of arrival being undertaken by timer, the timing of being undertaken by timer is resetted.

In addition, in the judgement of step ST118, when judge the timing undertaken by timer not time of arrival t2(NO) time, control part (the second control part) 100 makes to process and returns to step ST118.

At step ST119(step ST118:YES) in, control part (the second control part) 100 is from light accepting part 25(belt sensor 21) obtain light quantity detection signal.

In step ST120, the light quantity detection signal of control part (the second control part) 100 based on obtaining, determines the detection band position of intermediate transfer belt 7.

In step ST121, control part (the second control part) 100 judges and detects band position whether outside extent of amendment (sensing range A1).In above-mentioned steps ST121, when judgement detects band position extent of amendment outside when (YES), control part (the second control part) 100 makes processing advance to step ST108(with reference to Fig. 9).Thus, even in the time that the position of change intermediate transfer belt 7 can not make the detection band position of intermediate transfer belt 7 turn back in extent of amendment, make to process advancing to step ST108, and carry out emergent stopping processing.

In addition,, in step ST121, when judgement detects band position in extent of amendment when (NO), control part (the second control part) 100 makes to process and advances to step ST122.

At step ST122(step ST121:NO) in, control part (the second control part) 100 judge intermediate transfer belt 7 whether with the butt position of photosensitive drums 2a, 2b, 2c butt on.In above-mentioned steps ST122, when judging that intermediate transfer belt 7 is on butt position when (YES), control part (the second control part) 100 makes to process and advances to step ST123.In addition, in step ST122, when judge intermediate transfer belt 7 not on butt position (NO), while leaving on position, control part (the second control part) 100 makes to process and advances to step ST125.

At step ST123(step ST122:YES) in, control part (the second control part) 100 is fixed on the position of intermediate transfer belt 7 on butt position.Specifically, control part (the second control part) 100 remain in the regulation region of RAM, set and represent that intermediate transfer belt 7 moves to the state of the mark of butt position.

In step ST124, printing mode is set as four look colored printings by control part (the second control part) 100, and control belting 20, to the first driving motor 18 output drive signals.Thus, in printer 1, rotating band device 20, starts four look colored printings again.In addition, control part (the second control part) 100 is controlled display panel drive division (not shown) simultaneously, the information that makes the upper display notification of display panel (not shown) of operating portion 70 can carry out four look colored printings.Thus, the processing of process ends figure.

On the other hand, at step ST125(step ST122:NO) in, control part (the second control part) 100 is fixed on the position of intermediate transfer belt 7 to leave on position.Specifically, control part (the second control part) 100 remain in the regulation region of RAM, set and represent that intermediate transfer belt 7 moves to the state of the mark that leaves position.

In step ST126, control part (the second control part) 100 is set printing mode for black and white printing, and controls belting 20, to the first driving motor 18 output drive signals.Thus, in printer 1, rotating band device 20, starts to carry out black and white printing again.In addition, control part (the second control part) 100 is controlled display panel drive division (not shown) simultaneously, the information that makes the upper display notification of display panel (not shown) of operating portion 70 can carry out black and white printing.Thus, the processing of process ends figure.

In addition, in step ST124 and step ST126, control part (the second control part) 100 is controlled display panel drive division (not shown), make the information that on the display panel of operating portion 70, display notification can be carried out four color looks or black and white printing, and the information that also can display notification need to be checked by maintenance personal.

Then, the processing of the process flow diagram based on shown in above-mentioned Fig. 9～Figure 11, concrete example when control part (the first control part, the second control part) 100 is implemented to the swing correction of intermediate transfer belts 7 describes.

First, describe revising by second the situation that (abnormal time swing correction) be adapted to intermediate transfer belt 7 in extent of amendment.

Figure 12 is the curve map that represents to carry out the displacement with end face 7a while making the fixing swing correction in the past of Tape movement speed.Figure 13 is the curve map of the displacement with end face 7a while representing to carry out the swing correction of present embodiment.In Figure 12 and Figure 13, transverse axis represents time t, and the longitudinal axis represents the position with end face 7a with position d().

In addition, " a " shown in Figure 12 and Figure 13, " b1 " and " b2 " dot-and-dash line and the center line a shown in Fig. 6, boundary line b1, b2 are corresponding.Therefore, represent the movement of band edge face 7a to rear side from the center line a of curve map displacement downwards.In addition, represent the movement of band edge face 7a to front side from the center line a of curve map displacement upward.In Figure 12 and Figure 13, be illustrated in the state (Figure 14 described later and Figure 15 are too) that in interval S2, intermediate transfer belt 7 significantly swings to front side.

As shown in Figure 12 and Figure 13, in the time that the position with end face 7a of intermediate transfer belt 7 is in extent of amendment (sensing range A1) (interval S1), carries out first and revise.In this case, the rotating speed when rotating speed of driven roller 17 (Tape movement speed) all becomes the first correction in Figure 12 and Figure 13.

In addition,, in the time that the position with end face 7a of intermediate transfer belt 7 is outside extent of amendment (sensing range A1) and in permissible range (sensing range A2) (interval S2), carries out and second revise when abnormal (swing correction).At this, in swing correction (with reference to Figure 12) process in the past, the rotating speed when rotating speed (Tape movement speed) of driven roller 17 keeps first to revise.Therefore, the second swing correction of revising finishes and till arriving the swing correction (interval S3) of the first correction, needs time T 1.

On the other hand, in swing correction (with reference to Figure 13) process of present embodiment, the rotating speed of the rotating speed (Tape movement speed) of driven roller 17 during than the first correction fast (at a high speed).Therefore, second revise finish and arrive first revise swing correction (interval S3) till, need time T 2(< time T 1).

Thus, according to the swing correction of the present embodiment shown in Figure 13, in the second correction (interval S2) process, can make the intermediate transfer belt 7 swinging promptly return to target location.Therefore, the chromatography of having removed toner image due to the short time is inaccurate, so the productivity of printed article can be declined and is suppressed to Min..In addition, in the second makeover process, due to location-independent with end face 7a detecting, drive the second driving motor 38 with peaked drive volume, so can further make the intermediate transfer belt 7 swinging promptly return to target location.In addition,, during due to emergency condition outside permissible range of the position with end face 7a of the intermediate transfer belt 7 being detected by belt sensor 21, stop the driving of driven roller 17, so the bad phenomenon that can prevent intermediate transfer belt 7 to depart from from driven voller 16.

Then,, even revise implementing second with the stipulated time, the situation that intermediate transfer belt 7 can not be adapted in extent of amendment describes.

Figure 14 is the curve map that represents to carry out in four look colored printings the displacement with end face 7a while swinging correction.Figure 15 is the curve map that represents to carry out in black and white printing the displacement with end face 7a while swinging correction.In the printing mode of Figure 14 and Figure 15, four look colored printings are recited as to " colored printing ".

As shown in figure 14, in the situation that printing mode is colored printing, in the time that the position with end face 7a of intermediate transfer belt 7 is outside extent of amendment (sensing range A1) and in permissible range (sensing range A2) (interval S2), carries out illustrated in fig. 13 second by control part (the first control part) 100 and revise.

And, as shown in figure 14, even revise when implement second with time t1 in interval S2, can not make the position with end face 7a of intermediate transfer belt 7 return to extent of amendment (sensing range A1) when interior, after elapsed time t1, control part (the second control part) 100 makes the position of intermediate transfer belt 7 change to and leave position from butt position.After this, at intermediate transfer belt 7, in leaving under the state of position, control part (the second control part) 100 is further implemented second with time t2 and is revised.

After this, as shown in figure 14, when being changed into, intermediate transfer belt 7 leaves under the state of position, revise by implementing second with time t2, make the position with end face 7a of intermediate transfer belt 7 return to extent of amendment (sensing range A1) when interior, control part (the second control part) 100 is fixed on the position of intermediate transfer belt 7 to leave on position.In addition, the time point that the swing correction (interval S3) when to the first correction is shifted simultaneously, printing mode is set as black and white printing by control part (the second control part) 100, and printing is started again.In this case, in printer 1, although can not carry out four look colored printings, can carry out black and white printing.

On the other hand, as shown in figure 15, in the situation that printing mode is black and white printing, in the time that the position with end face 7a of intermediate transfer belt 7 is outside extent of amendment (sensing range A1) and in permissible range (sensing range A2) (interval S2), carries out illustrated in fig. 13 second by control part (the first control part) 100 and revise.

And, as shown in figure 15, even revise when implement second with time t1 in interval S2, can not make the position with end face 7a of intermediate transfer belt 7 return to extent of amendment (sensing range A1) when interior, after elapsed time t1, control part (the second control part) 100 makes the position of intermediate transfer belt 7 change to butt position from leaving position.After this,, under the state at intermediate transfer belt 7 in butt position, control part (the second control part) 100 is further implemented second with time t2 and is revised.

After this, as shown in figure 15, change under the state of butt position when making intermediate transfer belt 7, revise by implementing second with time t2, make the position with end face 7a of intermediate transfer belt 7 return to extent of amendment (sensing range A1) when interior, control part (the second control part) 100 is fixed on the position of intermediate transfer belt 7 on butt position.In addition, the time point that the swing correction (interval S3) when to the first correction is shifted simultaneously, printing mode is set as colored printing by control part (the second control part) 100, and printing is started again.In this case, in printer 1, although can not carry out black and white printing, can carry out four look colored printings.

At intermediate transfer belt 7, with respect to photosensitive drums 2a～2c during in butt position and in the time leaving position, the swing tendency of above-mentioned intermediate transfer belt 7 changes.Can think that this is because by making intermediate transfer belt 7 with respect to photosensitive drums 2a～2c butt or leaving, poor front side or the rear side that occurs in intermediate transfer belt 7 of the degreeof tortuosity of intermediate transfer belt 7 and the transporting velocity being caused by tension variation.

Therefore, even revise when implementing second with the stipulated time (time t1), can not make intermediate transfer belt 7 return in extent of amendment time, can be by changing the position relationship (butt/leaving) of photosensitive drums 2a～2c and intermediate transfer belt 7, change the swing tendency of intermediate transfer belt 7.Therefore,, in the second makeover process, in the time that intermediate transfer belt 7 can not return in extent of amendment, by changing the position relationship of photosensitive drums 2a～2c and intermediate transfer belt 7, the possibility that intermediate transfer belt 7 returns in extent of amendment becomes large.

And, when passing through to change the position relationship of photosensitive drums 2a～2c and intermediate transfer belt 7, when intermediate transfer belt 7 returns in extent of amendment, by fixing the photosensitive drums 2a～2c of this time point and the position relationship of intermediate transfer belt 7, can make printer 1 with a kind of printing mode running in colored printing or black and white printing.

According to the printer of above-mentioned embodiment 1, for example, can obtain following effect.

In the printer 1 of present embodiment, even when control part (the second control part) 100 control roll position adjusting mechanisms 22, utilize the swing of the function correction intermediate transfer belt 7 of the first control part, can not make intermediate transfer belt 7 return in extent of amendment time, control part (the second control part) 100 is controlled portions of travel mechanism 90, changes many second opposed portions of primary transfer roller 13a～13c() position.

Thus, in the second makeover process, in the time that intermediate transfer belt 7 can not return in extent of amendment, by changing the position of primary transfer roller 13a～13c, the possibility that intermediate transfer belt 7 returns in extent of amendment becomes large.And, when passing through to change the position of primary transfer roller 13a～13c, when intermediate transfer belt 7 returns in extent of amendment, can be according to the position of the primary transfer roller 13a～13c of this time point, make printer 1 with a kind of printing mode running in colored printing or black and white printing.Therefore,, according to the printer of present embodiment 1, can avoid as much as possible becoming the state that can not carry out colored printing, can not carry out black and white printing in the time that anomalous swing occurs intermediate transfer belt 7.

In addition, control portion of travel mechanism 90 at control part (the second control part) 100, after changing the position of primary transfer roller 13a～13c, in the time that intermediate transfer belt 7 returns in extent of amendment, control part (the second control part) 100 keeps primary transfer roller 13a～13c position after changing.

Thus, when passing through to change the position of primary transfer roller 13a～13c, when intermediate transfer belt 7 returns in extent of amendment, by keeping the position of primary transfer roller 13a～13c of this time point, can make printer 1 remain in operation with a kind of printing mode in colored printing or black and white printing.

In addition, even when control part (the second control part) 100 control roll position adjusting mechanisms 22, utilize the swing of the function correction intermediate transfer belt 7 of the first control part, can not make intermediate transfer belt 7 return in extent of amendment time, if the position of primary transfer roller 13a～13c is butt position, control part (the second control part) 100 is controlled portions of travel mechanism 90, the position of primary transfer roller 13a～13c is become and leave position.

Thus, when the position of primary transfer roller 13a～13c is in butt position when (four look colored printings), if intermediate transfer belt 7 can not return in extent of amendment, make the position of primary transfer roller 13a～13c become and leave position (black and white printing).Therefore,, in printer 1, can carry out black and white printing.

In addition, even when control part (the second control part) 100 control roll position adjusting mechanisms 22, utilize the swing of the function correction intermediate transfer belt 7 of the first control part, can not make intermediate transfer belt 7 return in extent of amendment time, if the position of primary transfer roller 13a～13c is for leaving position, control part (the second control part) 100 is controlled portion of travel mechanism 90, makes the position of primary transfer roller 13a～13c become butt position.

Thus, when the position of primary transfer roller 13a～13c is in the time leaving position (black and white printing), if intermediate transfer belt 7 can not return in extent of amendment, make the position of primary transfer roller 13a～13c become butt position (four look colored printings).Therefore,, in printer 1, can carry out four look colored printings.In addition, in this case, not only can carry out four look colored printings, also can carry out black and white printing.

In addition, vergence direction and the angle of inclination of the rotation axis of driven voller 16 determined in the position of control part (the first control part) 100 intermediate transfer belts that detect according to belt sensor 21 7, and control roll position adjusting mechanism 22 makes the rotation axis of driven voller 16 become described vergence direction and angle of inclination.

Therefore, can be according to the swing position of intermediate transfer belt 7, intermediate transfer belt 7 is promptly returned in extent of amendment.

Above, the preferred embodiment of the present invention is illustrated, but the present invention is not limited to above-mentioned embodiment, can implements in every way the present invention.

The portion of travel mechanism 90 of present embodiment is as moving to the framework 91 of supporting primary transfer roller 13a～13c with respect to the butt position of photosensitive drums 2a～2c or leaving the mechanism of position, and it comprises offset cam 92 and the 3rd driving motor 93.But be not limited to this, can form portion of travel mechanism 90 by driving motor and gear mechanism.In this case, by made gear mechanism rotate by the rotating force of driving motor, the framework 91 of rotation axis 23a supporting that can make to be supported roller 23 is to butt position or leave position and move.

In addition, also can form portion of travel mechanism 90 by the bar being connected with framework 91 and driving member.In this case, carry out driving stem by the power being produced by driving member, the framework 91 of rotation axis 23a supporting that can make to be supported roller 23 is to butt position or leave position and move.

The control part (the first control part) 100 of present embodiment is by comparable data table (ROM), determine vergence direction and the angle of inclination of the rotation axis of driven voller 16, this tables of data (ROM) makes the light quantity detection signal (magnitude of voltage) exported from belt sensor 21 with corresponding for making intermediate transfer belt 7 return to vergence direction and the angle of inclination of rotation axis of the needed driven voller 16 in predefined target location.But be not limited to this, also can utilize vergence direction and the angle of inclination of calculating the rotation axis of driven voller 16 using light quantity detection signal (magnitude of voltage) as the calculating formula of parameter.

In the present embodiment, the example that image processing system of the present invention is applied in the printer that can carry out four look colored printings and black and white printing is illustrated.But be not limited to this, the present invention can be widely used in the image processing system that endless belt can move to butt position with respect to photosensitive drums and leave position.For example, can be applied to the duplicating machine, the facsimile recorder device etc. that possess said structure.

The embodiment that this instructions is recorded due to scope of the present invention and can't help the disclosed detailed content of instructions and determine, but defined by the record of claim, so should be understood to just illustrate and not limit.Therefore, the change of all scopes that do not depart from claim, boundary or be included in the scope of claim with the content that described scope, boundary are equal to.

Claims (7)

1. an image processing system, is characterized in that comprising:

The first image carrier, forms toner image;

Multiple the second image carriers, form toner image;

The transfer belt of annular, transfer printing is formed on the described toner image on described the first image carrier and/or described the second image carrier;

Driven roller, rotates and supports freely described transfer belt, and described transfer belt is rotated;

Driven voller, rotates and supports freely described transfer belt;

The first opposed portion, across described transfer belt and relative configuration of described the first image carrier, makes described transfer belt and described the first image carrier butt;

Multiple the second opposed portions, across described transfer belt and relative configuration of described multiple the second image carriers, can be arranged in and make the butt position of described transfer belt and described multiple the second image carrier butts and make described transfer belt leave a position leaving position of described multiple the second image carriers;

Portion of travel mechanism, the position that makes described multiple the second opposed portions to described butt position or described in leave position and move;

Positional information obtaining section, obtains the positional information on the Width of described transfer belt;

Roller position adjusting mechanism, adjusts the posture of the rotation axis of described driven voller;

The first control part, according to the positional information of the described transfer belt being obtained by described positional information obtaining section, is identified for making described transfer belt to return to the update information of predefined target location, and controls described roller position adjusting mechanism according to described update information; And

The second control part, at described the first control part according in roller position adjusting mechanism process described in described update information control, in the time that described transfer belt is not returned in the extent of amendment centered by described target location and outside extent of amendment at the appointed time, portion of travel mechanism described in described the second control part control, changes the position of described multiple the second opposed portions.

2. image processing system according to claim 1, it is characterized in that, when described the second control part is by controlling portion of described travel mechanism, change the position of described multiple the second opposed portions, while making described transfer belt return in described extent of amendment, portion of travel mechanism described in described the second control part control, keeps the position after changing of described multiple the second opposed portions.

3. image processing system according to claim 1 and 2, it is characterized in that, be positioned under the state of butt position in described multiple the second opposed portions, at described the first control part according in roller position adjusting mechanism process described in described update information control, in the time that described transfer belt is not returned in described extent of amendment and outside described extent of amendment at the appointed time, portion of travel mechanism described in described the second control part control, makes described multiple the second opposed portion move to leaving position.

4. image processing system according to claim 1 and 2, it is characterized in that, be positioned under the state that leaves position in described multiple the second opposed portions, at described the first control part according in roller position adjusting mechanism process described in described update information control, in the time that described transfer belt is not returned in described extent of amendment and outside described extent of amendment at the appointed time, portion of travel mechanism described in described the second control part control, makes described multiple the second opposed portion move to butt position.

5. image processing system according to claim 1 and 2, is characterized in that,

Described roller position adjusting mechanism can be adjusted vergence direction and the angle of inclination of the rotation axis of described driven voller,

Described the first control part is according to the positional information of the described transfer belt being obtained by described positional information obtaining section, determine vergence direction and the angle of inclination of the rotation axis of described driven voller, and control described roller position adjusting mechanism, make the rotation axis of described driven voller become described vergence direction and described angle of inclination.

6. image processing system according to claim 3, is characterized in that,

Described roller position adjusting mechanism can be adjusted vergence direction and the angle of inclination of the rotation axis of described driven voller,

Described the first control part is according to the positional information of the described transfer belt being obtained by described positional information obtaining section, determine vergence direction and the angle of inclination of the rotation axis of described driven voller, and control described roller position adjusting mechanism, make the rotation axis of described driven voller become described vergence direction and described angle of inclination.

7. image processing system according to claim 4, is characterized in that,

Described roller position adjusting mechanism can be adjusted vergence direction and the angle of inclination of the rotation axis of described driven voller,

Described the first control part is according to the positional information of the described transfer belt being obtained by described positional information obtaining section, determine vergence direction and the angle of inclination of the rotation axis of described driven voller, and control described roller position adjusting mechanism, make the rotation axis of described driven voller become described vergence direction and described angle of inclination.

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